Answer: slag

AnswerCrossword Clue
SLAGRefinery dross
SLAGMetal waste
SLAGSmelter refuse
SLAGSmeltery by-product
SLAGVolcanic dross
SLAGRefinery residue
SLAGSmelter's waste
SLAGBlast furnace refuse
SLAGMetallic by-product
SLAGCoal furnace waste
SLAGCinderlike lava
SLAGSmelting waste
SLAGCinder
SLAGFused matter removed from ore
SLAGRefuse in a steel mill
SLAGMetal matter
SLAGSmelting residue
SLAGFurnace waste
SLAGRefinery waste
SLAGSmelt residue
slagrefuse matter separated during the smelting of a metal from its ore
SLAGJunk rock
SLAGRefinery leftover
SLAGSmeltery residue
SLAGSmelting refuse
SLAGSmelter residue
SLAGTailings
SLAGBlast furnace by-product
SLAGSmeltery waste
SLAGDiss, in the UK
SLAGSmelting leftover
SLAGDross
SLAGSmelting by-product
SLAGSmelting byproduct
SLAGMetallic waste
SLAGOre-refining residue
SLAGMetal refuse
SLAGFused refuse
SLAGSmeltery byproduct
SLAGFoundry waste